U-Series - cirdles

Archaeo-info - Uranium-Seriesdating

19, Beitucheng Western Road, Chaoyang District, 100029, Beijing, P.

UraniumSeries Chronology Laboratory----INSTITUTE OF GEOLOGY AND.

Secular equilibrium: A situation in which the quantity of a radioactive isotope remains constant because its production rate (due to decay of a parent isotope) is equal to its decay rate.These elements are usually present in constant (equilibrium) amounts in a sample, as long as the system remains closed.

Uranium-seriesdating of gypsum speleothems -

Secular equilibrium can only occur in a radioactive decay chain if the half-life of the daughter radioisotope is much shorter than the half-life of the parent radioisotope, as typical of the uraniumseries decay chains.